feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/lucide-react/dist/esm/icons/radius.js

@@ -0,0 +1,18 @@
+/**
+ * @license lucide-react v0.303.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.js';
+
+const Radius = createLucideIcon("Radius", [
+  ["path", { d: "M20.34 17.52a10 10 0 1 0-2.82 2.82", key: "fydyku" }],
+  ["circle", { cx: "19", cy: "19", r: "2", key: "17f5cg" }],
+  ["path", { d: "m13.41 13.41 4.18 4.18", key: "1gqbwc" }],
+  ["circle", { cx: "12", cy: "12", r: "2", key: "1c9p78" }]
+]);
+
+export { Radius as default };
+//# sourceMappingURL=radius.js.map